I cannot make the AV700TV play the audio it recorded from an analogue source when the record format is ADPCM. The play screen opens but the track bar does not advance. There is no sound output.

Does anyone else have this problem, or know of a fix?
I am using firmware 1.6.06
My PC does play an ADPCM file reciorded by the AV700TV.
The AV700TV does play PCM faudio files.
I have reported this to Archos Technical Support (via their WEB site) but no response was received within their expected timescale.
I've called Archos Technical Support (several times via telephone at 25p/min) but after keying the passcode they play music or just hang up.
I suspect this is a fault and so intend to return the unit to Currys within the 28 days. If it is a common fault a refund would be preferable to a replacement. To help me decide, please post your experience with this unit.